SANTA CRUZ — An early morning fire caused about $30,000 in damage and forced the evacuation of a Riverside Avenue hotel Saturday, according to the Santa Cruz Fire Department.

The fire broke out in a two-story suite in the Hotel Pure Beach Inn on the 600 block of Riverside Avenue at 5:15 a.m. When firefighters arrived, a moderate amount of smoke was coming from the third floor of the building. However, the hotel”s sprinkler system had activated and the blaze was contained to a mattress and box spring in the second story of the suite, fire officials said.

The occupants of the room tried putting out the fire by dragging the sheets off the bed, but the synthetic material stuck to their skin, fire officials said.

They suffered second degree burns but declined to be treated by medics, fire officials said.

“The bed was in the middle of the room so there was no threat to surrounding electronics,” Battalion Chief Mike Venezio said.

The incident, which fire investigators determined was accidental, caused $10,000 in fire damage and $20,000 in water damage, officials said. According to Venezio, cigarette packs were found in the room, but no evidence indicated that cigarettes were the cause of the blaze.

Three fire engines, a fire tuck, a battalion chief and 14 firefighters responded to the incident.